how to fix P0171 code in my Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold and throttle body for cracks or disconnections.
  • Use a smoke machine or apply a carburetor cleaner around suspected areas to identify leaks.
  • If leaks are found, replace cracked hoses or reattach disconnected hoses.

3. Check and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, usually positioned between the air filter and throttle body.
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the sensor from its housing using a Torx or Phillips screwdriver.
  • Clean the MAF sensor wire using MAF sensor cleaner. Do not touch the wires directly.
  • Reinstall the sensor and reconnect the electrical connector securely.

4. Fuel System Inspection

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail to check the fuel pressure against the manufacturer's specifications.
  • If the pressure is low, inspect the fuel pump and fuel filter for proper operation. Replace as necessary.
  • If the filter is clogged, replace it with a manufacturer-recommended part.

5. Replace Oxygen Sensors (if necessary)

• Sub-steps:
  • Identify the upstream oxygen sensor (pre-catalytic converter) and, if applicable, the downstream sensor.
  • Use an oxygen sensor socket to carefully remove the faulty sensor.
  • Install the new sensor, ensuring it is properly torqued as per specifications (usually around 30 ft-lbs).
  • Reconnect the electrical connector securely.